transforming lparm to a Rectangle structure

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kurotsuke - 13 Jun 2004 16:05 GMT

Hi,

I'm working with C# and I'm overriding the WindowProcedure the catch
the WM_MOVING message. How can I convert the lParam object passed by
the Message to a Rectangle so that I can change its dimensions and
pass it back to lParam?
Any help will be appreciated.
Thanks.
Andrea

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Mattias Sj?gren - 13 Jun 2004 19:30 GMT

Andrea,

>I'm working with C# and I'm overriding the WindowProcedure the catch
>the WM_MOVING message. How can I convert the lParam object passed by
>the Message to a Rectangle so that I can change its dimensions and
>pass it back to lParam?

Marshal.PtrToStructure, and then Marshal.StructureToPtr to copy it
back.

Message.GetLParam provides a shortcut for Marshal.PtrToStructure.

Since you're working in C#, another option is to use unsafe code and
real pointers (cast the lParam IntPtr to a RECT*).

Mattias

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Mattias Sjögren [MVP] mattias @ mvps.org
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